JQL to get linked issues between projects A and B

[Régis Gaboardi]

Hi all, I'm trying to use the BigPicture plugin.

I created a Project A which is new and I'm adding issues to it.

In the past, however, issues related to Project A were done in Project B.

When I add Project A and B to my BigPicture plugin, all 1k issues on Project B are shown in the gantt chart, that's why I'm looking for a query to only add to the gantt issues from Project B that are linked to issues in Project A.

I'm using Jira 6.3.

Thanks for any help you can give :)